Turbulence and Bose Condensation - Institut für Theoretische ...

The time evolution of the momentum distributions of created particles will be
presented, which show collective motion of plasma oscillation due to the back reaction
from the created particles. This plasma oscillation shows damping because
of interference between matter fields. I will also discuss the particle production
in a boost-invariantly expanding electric field which spans between two charged
plates receding from each other at the speed of light.
Parity Violation in Hydrogen and Squeezing
Martin Trappe
ITP, Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany
We discuss the propagation of hydrogen atoms in static electric and magnetic
fields in a longitudinal atomic beam spin echo (lABSE) Interferometer. The
atoms acquire geometric (Berry) phases that exhibit a manifestation of parity-
(P-)violation effects arising from electroweak Z-boson exchange between electron
and nucleus. We provide analytical as well as numerical calculations of the behaviour
of the metastable n=2 states of hydrogen. We are able to systematically
search for Berry phases with tailored properties. Besides maximizing P-violating
geometric phases emerging for the respective states we also find the possibility
to modify their decay rates, nearly at the order of a percent, solely through
P-conserving geometric phases. We also investigate possibilities to enhance the
precision of the interferometry experiment using squeezed many-particle states
instead of single atoms.
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